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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f87305d2ae9e290803ce68f8bac4b43c1c07a52adbe7b77adaff40d015ab8f7' 
  AND token = '5bcM0W0QL61feFaGX+6KdfRL12KWD2us5frmSbIOX0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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