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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33723de060f03117e700aacc950ee809a5f0b8819c056e3d8d2d7a3a043cdb2e' 
  AND token = '0acxAmq2CSk+3JkYosp+xcJyLsL/0RvzB5CexTTLu0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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