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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bfda98c9ead9b51d1b0cbbed4372445f9c289098384a9501eff776b27433bc' 
  AND token = 'X+Z2M56VqGKqC1ahbEffRzcRvlGlwem88yFmaq7U9r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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