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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958be9b5534b1361b88e3214e9ca6537307c6b6ba2f8714e159057a1bc512125' 
  AND token = 'p3oQLOLyERiGybw3jkdwvgmGYiZUUnf0b/uP+kIcnOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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