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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903781734180e566f47f936b6a8ef12abaf2e295ca9ca89ebbf3c6ccd8b9d16e' 
  AND token = '+NcM6CdhYgn1ezozeKni9hq9D5sFqGCUoQ3e6bSDWJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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