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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e77feaae00240c52eba222397982c53310abfdf102c3dea6fc54ef70675c6a' 
  AND token = 'Pf7/TwwoHxUtNa954GOzIQcNK17ZeU8WUR/EzF6Kzuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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