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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c79c55d9d83e3b44b1dad7288c2ca433463bf5e648cacd846dc1f493e167c0b' 
  AND token = 'rJifX0zY+W3OXspLfTJR6JkiBs/CT/5dXGMPFV2IcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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