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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9edbd48ca0277e3dfe99bf8016d97f43cc0fffcb87f075a015c901f05b2e2c' 
  AND token = '1Sc7J048/IC6noIJF4WnEdSmXAou0f3MUZCpPcpNOFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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