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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ea2bd9ca4d4d7644770935b33151243f1c0fc95b15fc5b65c8bfb0b823f84f' 
  AND token = 'kGQb2PUO4SdGekOD+xC4NUtCq+Sqt0wb8rno7sLKXK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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