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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cf7268e96dd548b4c1dd809c3ac0d9d92181e4f85a0a66eb6c5d0ac740ada8' 
  AND token = 'vcmmZFBEQwdg+xHmNBtYqWrOc+3avgDKQdPVi9g/IAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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