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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf71c4478dc2bb3ff3fffe16c2a1ee60b1086c1f484bd589ef7cc6e7c7e47e6' 
  AND token = 'vzIzUeElBi1yhy6mtADCPEK/R32IqSUWvT2jBekWwPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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