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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a147e89f553c9f15b682e2d5ced6c8aec5a01dbac87de1c8bd69ac0a1c41cb3' 
  AND token = 'ZAOChSF86ZYqIDegY/udnbhQnf7nYMsnBODcwoy1Y3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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