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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b4e038a3643d2fddd622d94d7117bc2c342ff861ead485e1e34f8d8f1e91b5' 
  AND token = 'rUodT8CQ4/aXVobmrIDzST6Ka36cA3n1ndT/6uZ636g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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