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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d51d5b30e6e144a27922374bf95b01e5b6d3c844fe364f9501cf80cffecde04' 
  AND token = '6egaZJNaNWluQHehY7KotXiQm3TzGEctGOAkV5KA7oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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