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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6535d58de7fafc299c6230c2b0a503f87ffc481f9cf017a7891027c053bd9b94' 
  AND token = 'C1teG4l091bBNeyTEp0dI/p9BHMCpw6MoSShjpAZj9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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