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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8a52025831682fd0b777e7aa474d244b2f8bce8e03616df6698bc070b0b616' 
  AND token = 'dZZ+q1jFk78zHM0o1LmEVmEawS3+1UVz+ca84zVxHyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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