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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087ea2c355cd9719f20f30a653594f97a14785257fa54ef5f4c5896ffb95f6fd' 
  AND token = 'jR8pXJ+KmdtcXJozAXh8zhyli5p3ocxBDjMpClA8Y5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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