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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f437bfb16ae31de2bd5c3d13e7e24c41cb75d2c3e2596cf68419caa56a9d8d' 
  AND token = 'SZ2yGHDMk0d1Kn4m120gABn/QvYHxzgybzobjM5bBs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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