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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58e08f24490606b27b41edb3e44e60c5f522c056bbeb581e711cf79924e4b8c' 
  AND token = 'h9cokXh6it/iBUaVHZpVR84OpyQZuORHAnYI/YvGxHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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