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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3e261e02b2c0fd5c9bf5f0bf00aee7866d9dddb51ced5e75acd7d250eb3a20' 
  AND token = 'PmrNCCVuEUfxYC7iR2ukvm6Aovs/2mq8IVL3OY6vgns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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