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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7a8dc27b9dd8f85ce4c5b5ff7de67781b4d4d351cc56df2df2147f774def31' 
  AND token = 'XsdvomIUGq9gBNtMpDbNRpTsMHe5ZtNhNuJgzcJtPfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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