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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fb762a6c926cc02db0cad6162b8b2816c68c55c266f1cf6872d47e01108d86' 
  AND token = 'Xw68iqxMT70uolaa1wLxHqsEFiL9kmKxFZ2IPSI3hmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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