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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081c6a3d591d0627e2e8cb4e2740400f0d53de58b1eedc8c253ad5ef02f145f2' 
  AND token = 'nFhYHpSDD7NOwe5Dxe4dWEJQZ/G51QWSZ26hwwfkHD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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