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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191b3f4ea9b6324fc260f68242940ec3dfc12dfbe8683e47b6d31e225ae23bba' 
  AND token = '1x5vDjL8xzTAeL44KYkbifmEW73aX3NFFhxqkNVYNSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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