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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d02de0250f01d30cf5f810e1ea94eb3a66a60be5659bebb495b13f9b2a0d1ae' 
  AND token = 'eKKANuJT48GxW8uwT3GeLdL2FfLLmRM3fgPlQDJn1p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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