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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b7571e58ef89fbbfa7838dc70c6bceed601e81f0b828e4f080a833f71d6445f' 
  AND token = '475LTq2UJEBZLF1g2RZstsL841dDPAfLXJuSe8/tyck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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