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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1fb4c00cbd959a185ebf64536f9b9f90ac10bf04992073860277a4227e0b3d' 
  AND token = '3fq/g6mlOsJAeZsIl+vWD9U97Q3/OfWNk4XMT7rNzPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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