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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80fd417e82a0e8314d29e45decdb7a58f516f9e4b0e5bfa42d7c1d3b003b7eb' 
  AND token = 'OdtWQaDFhaxkzQVwZZpuStbWK7vZkyvja96XafC32xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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