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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6988215b5df6c5284986cb3d40e097d9c2feaec680dcb956cfe326bc3035f185' 
  AND token = 'G+zy08dj3I9raGCv9mjHv+1U4t7TAbfqH6zZKOpRkD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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