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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1400a6756b75a3a0e819bb4d6db6db5e7693a664257029d42b1bf42815afcd' 
  AND token = 'AtTTZjA7FUtaVnbaZ1Ei7nXDh4FESjQozjfmnkk7ag0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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