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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70994a674da5d2e70263bf27f17a64415085bcec0559c8c99a2c244730ee2995' 
  AND token = 'kSM0y0+dv5QOV0xwi+gwng/uZUG1xZiti5d4sdr27AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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