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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0b7861ea1418f77eea20d958be4b9ad567c0e6c559778b9d56ae959a2705fe' 
  AND token = 'ZLCtlVdOm846A+IJgZESlFIcc/I3Rb5zWhbTE1LLx0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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