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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fb6b7b3c13d3c1dc054b1d8a1815b2b794bea55c3e4e0d46f4119b459bb761' 
  AND token = 'TJuzXTIraq92NdhLIW47hgODy/VFzXenl8cVYf2j1dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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