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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74046db15f35bc3f46129ab8281f7fff788b28172bfa066ab7947507bac68688' 
  AND token = 'kzOAuN8GRhWbS2+3mICp4t5Ol7VpiYJl0U5jc0RP2mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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