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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca50312104528a80f12bb7b9146c2403d1617561fd69a67e8aed8d2f0e45b507' 
  AND token = '7NXa1cv6o9ZBJVqe1VASCeTGxHeWgtEELHkJ4AcwApU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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