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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e929697415fc8031fbeb403b075a47dc6cceba56ed830370b1cd8d67ebe2e0b3' 
  AND token = '5ax3afQcb7pkuxwGH2Q036L/35GJiikCgyBimyny9iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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