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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895bf4a197ebda9ad53ea97bccecff93d56b54be4bc3379ffac17ed442207a0f' 
  AND token = 'An/ECYda/WGb1j4W5EdnFKL3M2EQFrcd2zkVojkfsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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