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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037a0255474a52d473d55551edb044a86530b731125b7ebda73edf103eb90265' 
  AND token = 'H8DDk89Iw9lX3js4+c/eSSmEzm4caveD97PtKpnzfKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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