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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308b3cf4e6c3374ba87b045319c07ecee70be8be84901dfcddabcc8338b9db49' 
  AND token = 'pLKi46h7AAIMCc0ong/cV51cOyroIaJvH/O6MM3oyPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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