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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfebd725e222150756f796893e6ece032f865d22f61ec599ac648a339c26b9f0' 
  AND token = 'fA2P88Khv9uSsi2iAse/Mr5dPeILAIQ/KiKxxYfDBPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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