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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e38cf59cf227518d0fcf373be4cfaaf324392ed1b09acba80be128e74bf1806' 
  AND token = 'dmEHZ9JMKNdDcr9RtDjD4X6hsGpRm+c+KVYrok0f7Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00210

JSON explain

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