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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d2d6ca34037066eb727f9c46260a81448e7bac9ec7fb233e3564e9d8a42932' 
  AND token = 'Y/HTZzlI89SMrwr2Eos4K6DDepfoOxhhuuJi0y78gyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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