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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38a59337e70d4d17602034cf226440be4a649b85718f6aae6e9fe8d3f277b03' 
  AND token = '6hqFPy/L6ai934y3ePwU73SN4GF0Bqr9QZquSDDkjn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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