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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cead22a9510c86af1b868786853a9ae3fd8d5ef08854201219668c5ef6b3d53a' 
  AND token = 'CRTck5oXYt2cdKHuof5py+15NsW6e+uOQxOgZrk5AF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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