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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0d002269d2a249e6a72c82791829a0ea281c6d0d5d0c76f6f643179ffee65a' 
  AND token = 'to9fz8dGPh7JTi7W9970DRaV9B2aHRZ1YCRSt3j+Sj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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