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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fda0c69bbc1a485bb6d66dda3723d4101dd1f6228872de0613104a051aeebd' 
  AND token = '0/eg1Sl2eLDsKWGLxJMDc6wCkRf5hKz+1werHlBZ6aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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