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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8df7b4ae472271eb9493e98dd00e9b8378a24863eeee9a4f3afa93e03e3d88' 
  AND token = 'kEtLx3XRKvBgGe7do+jYg9CgncaFpyLLpEERTI+1kzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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