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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4125c100474c0c409c65bb20d14dc84ccec81eb13ea2a7fc17001144e2d8d0' 
  AND token = '5lSuACgXFON5gTqa48LDDD/difW1HsrlRQqLYq2/D90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}