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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0939e67197c153bc4aca2b0d19d6699e5013333c75350b5403683ab2021a186e' 
  AND token = 'EQ54GDbtG5CjoE3YGppCAhawQO3uIe19AfCN3R3FOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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