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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a2ad7a7a88a925cc87b09f36f5c9bac4e948d1a2fe7e30048cea806e688b02' 
  AND token = 'INXPVCPEeGxSNJ7UCqGrN9ogpm7goHAvk5xdx5EKgQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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