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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cd6dba62d60ec35bff78bea720130c633ec6cf1730e59d3f348ba392706c8c' 
  AND token = 'kZ7+nG7O5XitdlrppJleM1WWA7CTAgq3f573zWtKqb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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